Yarn carrier stop block control mechanism for flat knitting machines



@cfi. 4, 1932.. H. F. PAGET 1,881,373

YARN CARRIER STOP BLOCK CONTROL MECHANISM FOR FLAT KNITTING MACHINES Filed Jan. 4, 1950 5 Sheets-Sheet 1 FIG. I. 21 l WITNESSES I INVENTOR:

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Oct. 4, 1932. H. F. PAGET 7 1,881,373

YARN CARRIER STOP BLOCK CONTROL MECHANISM FOR FLAT KNITTING MACHINES Filed Jan. 4. 1930 3 Sheets-Sheet 2 g; 10 Z 2 3 o J6 a 39 J5 Z0 .m 315 3Z1 1 i."

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Oct. 4, 1932. F, PAGET 1,881,373

YARN CARRIER STOP BLOCK CONTROL MECHANISM FOR FLAT KNITTING MACHINES Filed Jan. 4, 1950 3 sheets sneet 5 Q V 5 b 2:1." "I m;

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Patented Oct. 4, 1932 HAROLD F. PAGET, 0F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 HAINES HOSIERY MILLS, INQ, OF PHILADELPHIA, PENNSYLVANIA, A CURPORATION 0F PENNSYL- VANIA YARN CARRIER- STOP BLOCK CONTROL MECHANISM F03, FLAT KNITTING MACHINE Application filed January 4, 1930. Serial Ito. 4518,469.

This invention relates to controlsfor the yarn carrier stop blocks of flat knitting machines such as are employed in the manufacture of full fashioned stockings.

Knitting machines of the kind referredto ordinarily embody a multiplicity of ndividually Selectable sliding yarn carrler rods whereto reciprocatory movement is mparted through frictionbox connections with what is known as the friction box rod which has a fixed endwise throw. Two of .the earner rods are usually assigned to serve the auxiliary yarns incident to reinforcm the high heels and the heel checks of the stoc 1ngs, and the traverse of said rods must thereforebe restricted to prescribed limits. The function of so restricting the traverse of the reinforcing yarn carrier rods is relegated to a stop block located at or near the center of the machine, said block being fitted with suitable stops to cooperate with the carrier rods and being mounted so that it can be swung into and out of active position. These manipulationsof the stop block are ordinarily effected manually by the attendant in charge of the machine, and they necessarily entail stoppages which are obviously detnmental to economic production.

In its broadest aspect, my present invention is directed toward overcoming the recited drawbacks of prevailing practice through provision of means in the form of a simple "attachment whereby the manipulation of the stop block for the reinforcing yarn carriers is effected entirely automatically and while the machine is in operation.

One way in which the foregoing and other objects and advantages may be readily realized in practice will be manifest from the detailed description following in coordination with the attached drawings whereof, Fig. I is a fragmentary skeletonized rear elevation of a full fashioned stocking knitting machine equipped with my improved mechanism for automatically controlling the yarn carrier rod stop block.

Fig. IT is a fragmentary cross section of the machine taken as indicated by the arrows IIII in Fig. l.

Fig. HT is a similar view taken as indicated by the arrows III-TH in Fig. I, and,

Fig. IV is a fragmentary detail view corresponding to Fig. 11, and showing the yarn carrier rod stop block raised out of action.

In these several illustrations, 1 have delineated the control mechanism of my in vention in connection with a standardtype of flat knitting machine adapted for production of full fashioned hosiery. As shown, the

machine comprises a number of sliding yarn carrier rods 1015 which are guided for longitudinal reciprocation in curved bracket arms, whereof one is shown at 16 in Fig. H,

bolted'at intervals along a horizontal bar 17 at the top of the machine framework 18. Motion is imparted to the several carrier rods 1015 throu h friction boxes from the friction box rod not illustrated) in the usual and tabs of the stockings, to lay auxiliary yarns for reinforcing the desi ated areas of the fabric, by means of their carriers 11a, 14a,

crosswise of the sinkers 19 which "cooperate V with the needles 20, the traverse of said carrier rods being limited at this time by stops (not illustrated) in the center stop block shown at 21 in Figs. I and IT. This stop block 21 is swingable upward relative to the yarncarrier rods 1015, from the active positlon of Figll to the inactive position of Fig. 1V; and vice versa, about a fulcrum axis 22 which is supported by a rearwardly bowed bracket arm 23 bolted to the bar 17 with the brackets 16. The movement of the stop block 21 is limited in one direction through contact, with the bracket arm 23, of

a screw 24 adjustable in a tail lug projection 21a of said block 21. Ordinarily, the stop block 21 is manipulated by hand during quiescent periods of the machine to place it in active position relative to .the yarn carrier rods 15 preparatory to the reinforcing phase of the knitting, and to retract it after the reinforcement has been accomplished.

The mechanism which I have devised for obviating all manual manipulations of the yarn carrier rod stop block 21 as well as intermittently through a complete revolution by means fully disclosed hereinafter. As

- shown to the best'advantage in Fig. I, the

rotary cam 29v has a single lateral projection 29a on one of its side faces to engage a roller 30 on an arm 31. This arm 31 depends from one end of a rock shaft 32 with journal support in'a-drop bracket 33 bolted to the upper part of the transverse frame 27. To the opposite end of the rock shaft 32 is secured a horizontal arm 34 which is subject tothe downward pull of a helical tension spring 35 whereof the lower end is made fast to an anchorage 36 bolted to the back channelhorizontal 37 of the machine framework 18, see Figs. I and II. A vertically arranged link 38,'serves to couple the arm 34 with a supplemental extension piece 39 which is applied to the tail lug 21a of the stop block 21; As.

shown, theextension piece 39 is secured by means of the screw 24 that serves to limit the movement of thesto block 21 in the manner previously explaine Thus when the lateral projection 29a. of the rotary cam 29 on the auxiliary cam shaft 25 encounters the roller30 on the arm 31, motion is induced in the rock shaft 32 and communicated, through the arm 34, link 38 and supplemental extension piece 39, to the center stop block 21 as a consequence of which the latter is swung downward from the normal inactive position of Fig. IV to the active position of Fig. II to restrict the traverse of the carrier rods 11, 14. Upon passage of the projection 29a of the rotary .cam 29 beyond the province of the roller 30,

the center stop block 21 is automatically restored to its normal position of inactivity through the action of the spring 35 upon the various instrumentalities interposed. f

Although other means may be employed to overn actuation of the auxiliary cam sha t 25, I prefer to relegate that function to the measuring chain of the machine which is partly illustrated at 40 in Figs. I and III. Accordingly,1 equip the measuring chain 40 pivotally-supported with a number of suitably spaced special lugs or buttons 41 to undertravel a roller 42 on a finger 43 which is secured to one end of a shaft 44 that extends" crosswise of the machine. This cross shaft 44 has journal support in supplemental bearing brackets 45, 46 secured respectively to the back chanwhich is free on the auxiliary cam shaft 25 i and constantly oscillated through the rod connection 54 by an eccentric 55 on the main cam shaft of the machine and designated by the numeral 56 in Figs. I and III. With the arrangement just described, each time that one of the special lugs or buttons 41 on the measuring chain 40 engages the roller 42 on the finger 43, the resulting motion is communicated through the cross shaft 44, arm 48 and link 49 to the pawl guard 50, with attendant picking of a tooth of the ratchet wheel 51 and stepping about of the auxiliary cam shaft 25 to a corresponding extent. By suitably allocating the lugs or buttons 41 on the measuring, chain 40, it is evident that the control mechanism of my invention may be made to function inproper timed relation to other events in the knitting cycle of the machine.

- Having thus described my invention, I claim 1. In a fiat knitting machine including a multiplicity of sliding main and reinforcing yarn carrier rods, the combination of a stationarily-positioned stop block swingable crosswise of and adapted to restrict traverse of the reinforcing yarn carrier rods, said stop block having a tail lug fitted with an adjustable screw to limit the extent 'of its swinging. movement, a control attachment for the stop block comprising a supplemental extension piece secured to the tail lug aforesaid by the screw in the latter, and rotary cam co-ordinated through motion translating mechanism with the supplemental extension piece for automatically moving the stop block into and out of active position relative to the yarn carrier rods while the machine is in operation.

2. In a flat lmitting machine including a measuring chain, a main cam shaft, and a multiplicity of sliding main and reinforcing yarn carrier rods, the combination of. a pivotally-supported stationarily-positioned stop block swingable crosswise of and adapted to restrict traverse ofthe reinforcing yarn carrier rods, a control attachment for the stop block including an auxiliary cam shaft with a rotary cam thereon and co-ordinated instrumentalities to swing said stop block into and out of active position relative to the reinforcing yarn carrier rods while the machine is in operation, and pawling means actuated from the main cam shaft aforesaid under governance of the measuring chain to intermittently rotate the auxiliary cam shaft.

in testimony whereof, I have hereunto signed my name at Philadelphia, Pennsyl- Vania, this 30th day of December, 1929.

OLD F. PAGET. 

